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248 lines
8.1 KiB
Python
248 lines
8.1 KiB
Python
2 years ago
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"""Discover and load entry points from installed packages."""
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# Copyright (c) Thomas Kluyver and contributors
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# Distributed under the terms of the MIT license; see LICENSE file.
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from contextlib import contextmanager
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import glob
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from importlib import import_module
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import io
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import itertools
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import os.path as osp
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import re
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import sys
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import warnings
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import zipfile
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import configparser
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entry_point_pattern = re.compile(r"""
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(?P<modulename>\w+(\.\w+)*)
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(:(?P<objectname>\w+(\.\w+)*))?
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\s*
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(\[(?P<extras>.+)\])?
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$
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""", re.VERBOSE)
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file_in_zip_pattern = re.compile(r"""
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(?P<dist_version>[^/\\]+)\.(dist|egg)-info
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[/\\]entry_points.txt$
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""", re.VERBOSE)
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__version__ = '0.4'
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class BadEntryPoint(Exception):
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"""Raised when an entry point can't be parsed.
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"""
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def __init__(self, epstr):
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self.epstr = epstr
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def __str__(self):
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return "Couldn't parse entry point spec: %r" % self.epstr
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@staticmethod
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@contextmanager
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def err_to_warnings():
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try:
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yield
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except BadEntryPoint as e:
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warnings.warn(str(e))
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class NoSuchEntryPoint(Exception):
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"""Raised by :func:`get_single` when no matching entry point is found."""
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def __init__(self, group, name):
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self.group = group
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self.name = name
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def __str__(self):
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return "No {!r} entry point found in group {!r}".format(self.name, self.group)
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class CaseSensitiveConfigParser(configparser.ConfigParser):
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optionxform = staticmethod(str)
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class EntryPoint(object):
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def __init__(self, name, module_name, object_name, extras=None, distro=None):
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self.name = name
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self.module_name = module_name
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self.object_name = object_name
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self.extras = extras
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self.distro = distro
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def __repr__(self):
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return "EntryPoint(%r, %r, %r, %r)" % \
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(self.name, self.module_name, self.object_name, self.distro)
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def load(self):
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"""Load the object to which this entry point refers.
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"""
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mod = import_module(self.module_name)
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obj = mod
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if self.object_name:
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for attr in self.object_name.split('.'):
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obj = getattr(obj, attr)
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return obj
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@classmethod
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def from_string(cls, epstr, name, distro=None):
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"""Parse an entry point from the syntax in entry_points.txt
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:param str epstr: The entry point string (not including 'name =')
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:param str name: The name of this entry point
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:param Distribution distro: The distribution in which the entry point was found
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:rtype: EntryPoint
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:raises BadEntryPoint: if *epstr* can't be parsed as an entry point.
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"""
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m = entry_point_pattern.match(epstr)
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if m:
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mod, obj, extras = m.group('modulename', 'objectname', 'extras')
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if extras is not None:
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extras = re.split(r',\s*', extras)
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return cls(name, mod, obj, extras, distro)
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else:
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raise BadEntryPoint(epstr)
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class Distribution(object):
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def __init__(self, name, version):
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self.name = name
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self.version = version
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@classmethod
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def from_name_version(cls, name):
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"""Parse a distribution from a "name-version" string
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:param str name: The name-version string (entrypoints-0.3)
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Returns an :class:`Distribution` object
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"""
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version = None
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if '-' in name:
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name, version = name.split('-', 1)
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return cls(name, version)
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def __repr__(self):
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return "Distribution(%r, %r)" % (self.name, self.version)
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def iter_files_distros(path=None, repeated_distro='first'):
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if path is None:
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path = sys.path
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# Distributions found earlier in path will shadow those with the same name
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# found later. If these distributions used different module names, it may
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# actually be possible to import both, but in most cases this shadowing
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# will be correct.
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distro_names_seen = set()
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for folder in path:
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if folder.rstrip('/\\').endswith('.egg'):
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# Gah, eggs
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egg_name = osp.basename(folder)
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distro = Distribution.from_name_version(egg_name.split(".egg")[0])
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if (repeated_distro == 'first') \
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and (distro.name in distro_names_seen):
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continue
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distro_names_seen.add(distro.name)
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if osp.isdir(folder):
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ep_path = osp.join(folder, 'EGG-INFO', 'entry_points.txt')
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if osp.isfile(ep_path):
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cp = CaseSensitiveConfigParser(delimiters=('=',))
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cp.read([ep_path])
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yield cp, distro
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elif zipfile.is_zipfile(folder):
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z = zipfile.ZipFile(folder)
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try:
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info = z.getinfo('EGG-INFO/entry_points.txt')
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except KeyError:
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continue
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cp = CaseSensitiveConfigParser(delimiters=('=',))
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with z.open(info) as f:
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fu = io.TextIOWrapper(f)
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cp.read_file(fu, source=osp.join(
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folder, 'EGG-INFO', 'entry_points.txt'))
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yield cp, distro
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# zip imports, not egg
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elif zipfile.is_zipfile(folder):
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with zipfile.ZipFile(folder) as zf:
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for info in zf.infolist():
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m = file_in_zip_pattern.match(info.filename)
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if not m:
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continue
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distro_name_version = m.group('dist_version')
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distro = Distribution.from_name_version(distro_name_version)
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if (repeated_distro == 'first') \
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and (distro.name in distro_names_seen):
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continue
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distro_names_seen.add(distro.name)
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cp = CaseSensitiveConfigParser(delimiters=('=',))
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with zf.open(info) as f:
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fu = io.TextIOWrapper(f)
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cp.read_file(fu, source=osp.join(folder, info.filename))
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yield cp, distro
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# Regular file imports (not egg, not zip file)
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for path in itertools.chain(
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glob.iglob(osp.join(glob.escape(folder), '*.dist-info', 'entry_points.txt')),
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glob.iglob(osp.join(glob.escape(folder), '*.egg-info', 'entry_points.txt'))
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):
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distro_name_version = osp.splitext(osp.basename(osp.dirname(path)))[0]
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distro = Distribution.from_name_version(distro_name_version)
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if (repeated_distro == 'first') \
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and (distro.name in distro_names_seen):
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continue
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distro_names_seen.add(distro.name)
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cp = CaseSensitiveConfigParser(delimiters=('=',))
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cp.read([path])
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yield cp, distro
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def get_single(group, name, path=None):
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"""Find a single entry point.
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Returns an :class:`EntryPoint` object, or raises :exc:`NoSuchEntryPoint`
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if no match is found.
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"""
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for config, distro in iter_files_distros(path=path):
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if (group in config) and (name in config[group]):
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epstr = config[group][name]
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with BadEntryPoint.err_to_warnings():
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return EntryPoint.from_string(epstr, name, distro)
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raise NoSuchEntryPoint(group, name)
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def get_group_named(group, path=None):
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"""Find a group of entry points with unique names.
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Returns a dictionary of names to :class:`EntryPoint` objects.
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"""
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result = {}
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for ep in get_group_all(group, path=path):
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if ep.name not in result:
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result[ep.name] = ep
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return result
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def get_group_all(group, path=None):
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"""Find all entry points in a group.
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Returns a list of :class:`EntryPoint` objects.
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"""
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result = []
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for config, distro in iter_files_distros(path=path):
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if group in config:
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for name, epstr in config[group].items():
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with BadEntryPoint.err_to_warnings():
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result.append(EntryPoint.from_string(epstr, name, distro))
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return result
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if __name__ == '__main__':
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import pprint
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pprint.pprint(get_group_all('console_scripts'))
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